Improvement in stone-polishing machines



A. W. ROBERTS 4Sheets--Sheet1.

Improvement in Stone-Polishing Machine's. N0. 129,905. Patentedluly 30,,K8/72y Sheet 2.

4 Sheets- Patented- July 30,1872.

ROBERTS.

. 4Sheet s--Sheet3 improvement in'Stone-Polishing Machines.

Patented July30, 1872.

A, W, ROBERTS 4Sheets--Sheet4. Improvement in Stone-Polishing Machines.

. isher.

ATENT omen.

HALBERT w. BOBERTS,-OF HARTFORD, CONNECTICUT.

IMPROVEMENT IN STONE-POLISHING MACHINES.

Specification forming part of Letters Patent No. 129,905, dated July 30, 1872.

To all whom it may concern: 7

Be it known that I, ALBERT W. RoBnRrs, of the city and county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Stone-Polishing Machines; and to enable others skilled in the art to make and use the same I will proceed to describe it, referring to the drawing, in which the same letters indicate like parts in each of the figures.

The nature of this invention consists in the peculiar construction and arrangement of mechanism, whereby the power is imparted to the polisher at any desired elevation, the whole elevated and depressed so as to bring said polisher into close proximity with the siirface of the stone to be polished, and to cause it-the revolving polisher-to traverse, in any desirable manner, upon the surface of the stone, while the operator travels back and forth by the sideof the stone, and allow stone of any thickness to be placed under the pol- Figure 1 is a side elevation. Fig. 2 is a sectionview of the same. Fig. 3 is a plan or sectionthrough the upright frame. Fig. 4. is a plan, showing the movement of the swing-frame. Fig. 5 is a back and end view. Fig. 6 is a side elevation of an adjustable lever and rubber or polisher. Fig. 7 is a section of an adjustable lever, rubber, and polisher. Fig. Sis a plan of same. Fig. 9 is a top view of the adjustable lever, rubber, and polisher.

In the center of the bottom of the upright frame a is a bearing, a, which rotates or vibrates in a step, a, which is firmly fitted to the foundation. At the upper end and in the center of the frame a is a hollow bearing, ad. The outside of said bearing is fitted into a box, a Said box is secured to the frame-work of the building. At the lower end of the upright frame a, directly over the step a is arranged a post or support, at, having a step, 0, in its upper end to receive the lower end of the shaft 0 The upper end of this shaft c passes through the hollow bearing a and has a driving-pulley, d, secured thereon for operating the machine. The upright shaft 0 is provided with a spline orgroove in its side and nearly its.

whole length. Onto this shaft is fitted a sleeve, a so as to fit closely, and play freely up and down on, and turn only with, the shaft 0 On the outer surface of this sleeve, and at the lower end thereof, is formed a hearing, which bearing is secured in a box, 0 Said sleeeve-bearing has a shoulder at each end, outside of its box 0 Said box a is attached or secured to the vertical sliding or swinging frame g. At the upper end of the sleeve a is secured a pulley, d, the obiect'of which is to communicate power to a given point on the upright sliding frame, and allow said sliding frame to be raised or lowered to any desired height. 0 are guide way plates firmly secured to the sides of the upright frame a, upon which the operatingframe work is fitted, and works closely and freely up and down thereon.

The operating frame work is elevated and depressed by means of chain or cord 6 passing over pulleys c and connected to a crank-Windlass device, f, so that it can be easily and accurately elevated or depressed to any desired position. g g are the projecting portions of the operating or swing frame-work. These two parts work together upon a fulcrum-spindle or shaft, h. In other words, the two parts are connected toget-her by sleeve-joints, through the center of which the shaft operates; and upon the upper end of this shaft is fixed a pulley or pulleys, h. On the outer end of this pro- ,jecting frame is a hollow shaft, in which the spindle k is splined to allow said spindle to slide freely up and down and revolve with the hollow spindle to operate the polisher by pulley h The adjustable lever j is hinged upon the polisher-spindle, the inner end of which plays between the segmentplates is. In the inside edge of the segment plate are formed notches k into which a sliding catch, k enters, and is arranged, secured, and operated by a rod, W, on the upper side of the lever j, so that the operator can change the position of the lever relative to the machine, to suit his convenience for operating Vhat I claim, therefore, and desire to secure by Letters Patent, is-- V 1. In combination with a stonepolishing machine, an adjustable lever, segment, guide, and sliding catch, substantially as set forth.

2. In a machine for polishing stone, I claim the combination of the sleeve a splined shaft 0 pulley d, swinging frame 9 g, arranged and operating substantially as set forth.

ALBERT W. ROBERTS,

Witnesses:

FRANCIS G. BUTLER, JAMES B. WILLIAMS. 

